What happens when water freezes choose all that apply a. it becomes less dense b. it becomes more dense c. it expands d. ir contracts

A. It becomes less dense

C.it expands

Explanation:

. Water expands and becomes less dense when it freezes into ice. This means that ice floats in water instead of sinking. Aquatic organisms depend on this property of water during the winter. If ice were more dense than water, it would sink when frozen, crushing the organisms below it.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =